System for feeding pulverized fuel.



' UNITED STATES PATENT OFFICE.

VIRGINIUS Z. CABACBISTI, OF ALBANY,NE'W YORK, ASSIGNOE T0 LOCOMOTIVE PULVEBIZED FUEL COMPANY, A CORPORATION OF DELAWARE.

SYSTEM FOB. FEEIOING PULVEBIZED FUEL.

Patented Feb. 6, 1917.

Application led October 4, 1913. Serial No. 793,311.

To all 'whom t may concern:

Be it known that I, VincrNrUs Z. CARA- clus'rl, a citizen. of the United States of America, and resident of Albany, 1n the A cess of fuel over that mixed with theV oxygen nations of is returned to the receptacle. 20

For this purpose my invention consists of the following novel features and `combiparts which will be fullydescribed hereinafter and finally set forth in the claims. f x t In the accompanying drawings, which show an embodiment of my invention, Figure l is a'vertical longitudinal fcrosssection of my improved `device used to carry y yout my invention, and Fig. 2 is' a vertical `30 transverse section taken on line i 2--2 of i .1. I imilar reference characters indicate corres ending parts throughout the views. eferri to the drawings, the 'casing 10 is suppe. y a standard 11 arranged to give equilibrium to the casing. The front part of the casing 10 is provided with a converging member 13 adapted to receive the fuel and air intimately mixed and conve this mixture to thefurnace where the uel is brought to the ignition point. The casin 10 is provided with an opening 17 in whic is seated a member 14, having vanes or blades 15, arrangedin helical screw-fashion. The forward end of this-member 14 is proted vided with openings 16 which bring about the communication of the interior of the member 14 with the interior of the casing 10 so as to enable any air that is forced into the pipe 12, and from there into the casing 10, to enter the openings 16 and pass from t the exterior to the interior of the member 14. f From thence the air follows the direction of the arrows indicated by 3p. Within the member 14 and withinhthevspaces left between the innermost 'ends of the blades 15, a second member 20 is arranged, which has within it a screw 21 intended to feed the fuel, in the direction of the arrow 31, from the member 20 into the `forward end of the member 14, so that the fuel, as `it is fed forwardly, is impinged by the air entering. the

opening 16. The surfaces'of the veins 15 adjacent the periphery of the internal screw member 20 can be so shaped that they act as bearing surfaces to permit the revolution of this internal member 20. When this impingement takes place a very intimate contact between the oxygen and fuel takes place so that the mixture is ready for combustion,

and the fuel fed forwardly by the helical screw 21, in the direction of the arrow 31,

is forced into the member 13 in intimately mixed condition, and from thence into the furnace, to be there burned. Whatever fuel is not taken up by the air, drops to the lowermost ortion of the member 14 and is n caught up y the varies or blades 15 and re- `turned to the rearward portion of the member'14 and exterior of the member 20, until it is dumped into some suitable container,`

in the direction indicated by. the arrow 33.

When the screw Q1 rotates, fuel `is discharged in a loose powdery condition in a parabolic and downward stream into the forward end of the member 14, and this ef` fect may be` further `increased bv further breaking up the fuel by any suita )le means if desired, so that the fuel is fed into the forward end of the member 1.4 in a finely divided condition. On entering the forward part of the member 14 the fuel is subjected, as before stated, to the action of an air-blast entering through the orices 16. These ori ices are preferably inclined to the mouth of the sleeve, vso that the blast will carry the pulverized fuel away in the direction of the arrows 30. These orifices are also preferably open between threadings of the screw or similar inclined surfaces, which may be revolved, so that the air-blast has circular l eddies and whirls, whereby the stream, of

The feeding devices may be of any equiv:` i I ale'nt' form, and the blast may beproduced ;b'ythe, furnace'or any other suitable' me- *chanical device, The member 14 may'be otatably mounted in anysuitable manner known to those skilled in the art. So

also, suitable means' may rotate the'innerV screw'21, IIn the-drawing, the second meml ber- 20 isshown so" as to be capable o f-being arranged'to rotate with eitherscrew or stay AvI have described an embodiment of my :in-g 'vention, but changes may be made therein' lv without departing from the spirit of my l yentionas defined by the appended claims vv)What-I claim anddesirc. to secure bylietters Patent is:

fuel feeding means for feedingair to said fuel as it leaves the fuel feedingmeans and 5 as it commences its return movement in the return fuel means, said air feed' means -concentrical1y surrounding the ischarge [end of the fuel feeding Vmeans and the stream circumferentially a t sides of the fuel as it leaves the fuel feed- I ing nieana,said air feeding means being 1os point where it is means.

l ceptacle.

cated intermediate the point wheretlie fuel iV fed from said feeding 2. In a burner for pulverized fuel, an in- I' vclosed mixing space connected therewith,

means for feedin a current of fuel, means for injecting .inc 'ned' currents of air` into said mixing space underneath said current of fuel and beyond the end of the fuel feeding means, and means around saidfuel feeding means for returning the fuel not swept along by the'air current to its original re- 3. In aburner foi` vpuliverized fuel, an inclosed'space for air and fuel, means for injecting currents of fuel and air theresurfaces, and means for impingmg theair current upon moving-said surfaces in the direction ofthe fuel How before it impinges upon the current of fuel.

4. In a burner for *pulverized fuel, an jinclosed space for mixin said fuel with air, air feeding means for eeding the current 0f air to said inclosed space, and concentric feed and return screws operating'in opposite directions to respectively feed the fuel against the air current and to return the fuel not'swept along by said air current to 'its ori al receptacle, the said return screw extending beyond the said feed screw in the l A iirIeQeQn n which the fuel is fed from said feeding means, and returned by said Vreturn ing member for air and fuel, an air means vfor directinlgfeed screwdthe said air feedinglmeansA bemg locate intermediate the'dischargeend of the feed screw from which the' uel is fed, and the adjacent 'end of vthe return screw.

5. In a .burner for pulverized fuel, an invclcsedspace for mixing air and fuel, means for feeding acurrent of fuel thereimmeans for a, cur'rent of air therein, against.

- said current of fuel, and means for returning the fuel not swept along by said air currentfto its original receptacle, said air current ybeing admitted in vthe return patliof -th'e 'fuel to its original receptacle.

6. In a burner for pulverized fuel, an in- 'closed spacefor mixing said fuel', a screw for feediiiga current of fuel therein, means for injecting a current of air therein, against said current of fuel, and 'a screw for returnthe fuel notl swept along at first by vsaid air current to its` original receptacle, said air current being admitted between the venes ofsaidietmning sc rew'.'

7. '-a' burner for pulverized. fuel,v a member forfait and fuel, `a feed screwv foril feeding 1a Astream of fuel thereto,

a second ffeedfscre'w aroi'ind .the Erst feed i Screw forreturning the-fuel dropped there- 'in toits criginal place", and a plurality of `individual vair -cond arranged in respect'to the' first feed screw uits circumferentially for impinging currents against the fuel -fed bl the 'first-feed screw, as -it emanates there rom', and for impinging the air cur- V'rents 4against that portion of the fuel as it is taken up by the second feed screwfor the purpose of mixing air with the fuel thereby carried.- Y i f 8. In a burner for pulverized fuel, a mixbe d d th mixingfeeding mem r arrange aroun e ber, a fuel and air feeding member, hav- "ing converging'walls arranged in front of the air feeding member, and a member a't the rear of thev airfeeding member com rising a feed screw, a plurality of air conduits circumferentially arranged at that portion of ,the feed screw where it entersthe airfeeding member, whereby communication is made between the air feeding memberand the mixing member, and a'second feed screw of. reverse inclination within the first .main

'feed screw andhaving its end free ofthe aid conduits, and at one end of the member, so that any fuel fed thereby is impinged by the air currents passing through 1 the air conduits into the mixing member.

9. In a burner for pulverized fuel, a mixing. chamber for air and fuel, means for feeding a stream of fuel into said'cha'mber, an air current against means for again said stream of fue c ing those portions 'of the fuel not o swept away by said air current y yinto the path of said n.11-v current in said mixing la.

T10.` In a burner mixing chamberfor mixing said-air and fuel, means f as it 1s fed into the chamber, and means for returning those portions of the fuel not swept away to the original reeeptaele therefor.'

for pulverized. fuel, a

for feeding a stream of fuel into :said chamber, independent means for imping'in in the direction of the flow ofthe Vfuel, a current of air eir'eumferen all sides of said :zitreain of fuel mixing chamber and beyond the end of the fuel feeding means,

tially against 'and Ineens circumferentially around the fuel feeding" means for a those portions of said ,fuel not originally ain directly carrying paselng into said mixing 'chamber to the fuel feeding means to ver again fed to the mixing chamber and there :s'eifvffted to the Voperation of the current of air,

' v prising returnmggaportlon of the fuel, concentri-v 11. In a burner for pulverized oommeansgfor feeding fuel, means for cally; surrounding said feeding means, and extending'beyondv the discharge end thereof, and mea-nsat'the. discharge end of said fuel feedingfmeans' forfeeding a plurality of separated streams of air to said fuel as it the stream circumclosed'space for mixing air andfuel, means,

for injecting a current of gir and fuel therein, moving surfaces Vat 4the end of said fuel and air feeding means, and means for impinging a current of air upon said moving surfaces before mixing it with said fuel in the direction of the fuel flow.

In testimony that I claim the foregoing as my invention, I have signed my neme .in presenee'of two subscribing witnesses.

Witnesses:

F. Heee, G. LOWE. 

